Fluid-pressure motor.



A. G. BLVIN. FLUID PRESSURE MOTOR.

APPLICATION FILED MAB.. 10,*1910'.

Patented June 18, 1912.

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mln-m A, G. ELVIN. FLUID 'PRESSURE MOTOR. APPLIOATON FILED MAB.. 10,1910. 1,00906W Patsnted June 18, 1912.

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ALBERT G. ELVIN, GF' EAST- ORANGE, NEW JERSEY.

FLUm-rnnssnnn Moron.

Specification of Letters Patent.

Patented l une ltd, igl.

Application .tiled March 1D, 1910.l Serial No. 548,357.

VTn @Z- w/zom it may concern:

which shall attain. the advantages of'thatot'j said application, andembody the further.` advantages of effecting both the opening andclosure of the door by fluid pressure and of cushio-ning the movementsof the door in both directions.

The improvement claimed is hereinaftery fully set forth.

In the accompanying drawings'. Figure l'is a front view of a fireboxdoor operating appliance illustrating an application of my invention,with the operating cylinder there- 'of in longitudinal central sect-ion;Fig. 2, a plan or top view, partly in section, of the operatingcylinder; Fig. 3, a plan view, on

an enlarged scale, of the operating cylinder; Fig. 4, a verticallong1tudinal section t-hrough the lefthand portion of the operatingcylinder o'n the line a I) b of Fig. 3; Fig. 5, a transverse sectionthrough the operating cylinder, on the line 0 c of Fig. 3; Fig. G, apartial vertical longitudinal section through the same, on the line a ,aof Fig. 3; and, Fig. 7, a vertical section through the tiring openingand one of the door sections.

My invention is hereinu exemplified in connection with a fire doorappliance comprehending two door leaves or sections, 9, 9, which arelitted to slide horizontally toward and from each other in guides, 3, onadoo'r frame, and to cover and uncover, as the case may be, a firingopening, 2, m a

`irebox or furnace, 1, to which the door frame is connected. `The doorsections are moved from and toward each other, to open and close,respectively, the 'firing opening, by means of levers, 12, 12a, pivotedby pins or bolts, 16; to a downward extension of the operating cylinderhereinafter described, the lower and longer arms of said levers eingcoupled to the door sections. Intermeshing segment gears, 17, 17a, aretermen on the levers, concentric with their pivots, 13, and by theoscillation of said segment geans about their axes, the door sectionswill be moved from or toward each other, as the same may be. A handlever, i8, is pivoted to thc bottom guide o' the door iframe, and isprovided with a longitudinal slot, 18a, engaging a pin, 1Sb,fixed to thedoor section, 9, for the purpose of operating the door sectionsmanually, when desired.

In the practice of my invention, as applied in connection with a doormechanism ofthe type above described, a fluid pressureoperatingcylinder, 25, is bolted to the top of the door frame, Thecylinder, 25, is

cut away on its lower side, so as to allowA thesegment gears, 17, l7,ltoproject into 1t, and is closed at its ends by heads 26. 2T.

yThe bore et the cylinder, 25, is made of two ditlerent diameters, beinggreater at, and for some distance from, one of its ends, than fortheremainder of its length.

A piston, 2S, is fitted in t-he cylinder, Q5, said piston being, for themajor portion ot its length, of such diameter to lit neatly inthe'smaller bore of the cylinder, and having a head at one end,similarly fitting the larger here, suitable packing rings, 25), beingprovided in the head and at the opposite end of the piston, to preventleakage of fluid. The piston, QS, is recessed on its lower side, toadmit the segment gears, 17, 17, and a longitudinal rack or set ofteeth, 30, meshingwith the gear, 17, is formed in the recess of thepist-on. Movement to the right or to the left, as desired.` is impartedto the piston by fluid pressure, as hcl-cinA after described, andit willbe seen that such movement will, through the segment gears and theirconnections, move the door sections apart or bring them together, as thecase may be.

The supply and exhaust ot motive fluid to and from the opposite ends of'the piston, 28, toeffect the opening nduclosing movements of the doorsections, are e'i'cctcd by the following means. A valve chamber, 54-,which is closed at its top'by a removable plug, Bta,Y is formed in thehead, :26, of the operating cylinder, 25, said chamber communicating, atits bottom, with a cylindrical bore which extends through the head andhas a valve seat at its top. for the reception cfa door opening suppLand exhaust valve, 33, which seatsdownw rdly,

and is fixed upon a cylindrical stem, 35, iitting truly in thecylindrical and extending for a lshort distance below the lower endthereof. A valve chamber, 54, which is closed at its bottom by avremovable plug, 54, is formed in the opposite head, 27, of thecylinder, said chamber communicating, at its top, with a cylindricalbore which vextends through the head, but is closed to the atmosphere bya removable plug, 54". A valve seat is formed at the bottom of saidcylindrical'bore, for the reception of a door closing supply andexhaustvalve, 53, which seats upwardly and is fixed upon a cylindricalstem, 55, fitting truly in the cylindrical bore.

A supply pipe,\3l, leads from any suitable source of liuid pressuresupply, as a main reservoir of an air brake system, into a strainerchamber, 31, located on one side of "the operating cylinder, 25, whichchamber may be loosely packed with any material suitable to preventingress of dirt and other foreign matter. The supply pipe,

31, and strainer chamber, 31, communicate` by a passage, 31", with asupply passage, 43, which extends longitudinally in the wall ot' thecylinder, Q5, from one of its heads to had to its interior.

the other. The passage, 43, communicates, at one of its ends, with apassage 44, leading into the valve chamber, 34, and communicates, at itsopposite end, with a passage, 45, leading intb the valve chamber 54. Thecylindrical borel in which the stein otI the valve, 33, is litted,communicates with the adjoining end of the cylinder, E25, by a port, 46,and this cylindrical bore communicates with the atmosphere by an exhaustport, 48, located at a lower level than the port, 46. The area availablefor discharge of fluid through the exhaust port, 4S, may be varied, asdesired, by a regulating valve,

5l, formed on the end of an ad]ust1ng scre\v,

52, engaging a thread in the cylinder head, 26. The cylindrical boreinwhich the stem of the valve, 53, is fitted, communicates with theadjoining end of the cylinder, by a port, 4G", and communicates with theatmosphere by an exhaust port, 43, located at a higher level than theport, 461. rl"he valve stems, 35 and 55, are grooved or peripherallyrecessed, below and above the valves, 33 and'53, respectively, toeii'ect the opening and closure of ports, as hereinafter described.

A trip rod casing, 5G, is formed on the top of the cylinder, 25, toreceive and guide a longitudinally sliding trip rod, 57, the casingbeing provided with a removable cover plate, 5G, by the detachment ofwhich and of the cylinder head, Q7, access may be The trip rod, 57, isrecessed oi reduced inA section tor a portion ot its length. so as toprovide shoulders or bearings, 57a and 5T, against one or the borelvber, 34.

other of which a trip, 58, projecting upwardly from the piston, QS,abuts, in the movements ot'- said piston in either direction, and theend of the trip adjacent to the valve stem, 55, is provided with aninclined bearing face, 57C, adapted to abut against said valve stem andunseatI the valve, 54, as the piston, 28, approaches the terminal of'its stroke in the direction of said valve.

A rod, 39, having a head, 36, which is in contact with the lower end ofthe stem, 35, of the valve, 33, is fitted to slide vertically in aguide, 37, on the door frame, and is coupled, at its lower end, to adouble armed treadle lever, 4l, pivoted to the door frame and carrying atreadle, 42, which normally stands at a level slightly above that of thedeck or tiring floor of the iirebox. By downward pressure of his loot onthe treadle, 42, the iireman can, through the lever, 4l, and rod, 39,unseat the valve, 33, and upon the release of such pressure the valvewill be reseated by the pressure from the supply pipe acting upon it inits cham- A spring, 3U, may be applied to return the rod, 39, to normalposition.A

In the operation of the motor, the relnan presses his foot upon thetreadle, 4Q, there by unseating the valve, 33, and admitting fluid underpressure from the supply pipe, 31, and communicating valve chamber, 34,past the grooved or reduced portion of the valve stem, 35. and throughthe port, 43,'

to the leithand end oi the operating cylinder, 25, thereby moving thepiston, Q8, thereof, to the right, and, through the rack, 30, andsegment gears, 1i' and 1T, :imparting opening movement to the doorsections, 9, 9u. As the piston moves forward, and at a point in itstraverse at which it has nearly completed the opening movement of thedoor sections, the trip, 5S, which it carries, strikes the right handshoulder, 57h.' of the trip rod, 57, thereby moving the latter to therightand unseating the valve, 53, which admits tluid under pressure fromits chamber, 54, to the right hand end of the cylinder, Q5. This end oiEthe cylinder being ol smaller diameterl than the left hand or openingend, the pressure admitted will not. prevent the complete openingmovementet the door sections, but will cushion and pre 'vent them fromslamming or opening with a jar or shock. Upon the release ot pressurefrom the treadle, 4Q, the valve, 33, is seated by the fluid pressureabove it, thereby cut'- ting off the supply of fluid to the lett handend of the cylinder, and exhausting the fluid from the left hand side ofthe piston, 25,

through the exhaust port, 48. 4'lhe pressure v from the chamber, 54,acting on the right hand side ot' the piston will move 1t to the left,thereby unpartmg closing movement to the door sections, the trip rod,5T, holding the valve, 53, unseated until the trip, 58,

strikes the left hand shoulder, 579', of the trip rod, when the latter`will be moved to the lett, releasing the stem, of the valve,

which will be closed. by the pressure below it in its chamber, 5l, andwill cut ott the supply of fluid to the right hand end ot' the cylinder,and open an exhaust therefrom through the exhaust port, 48a. At thistime, the door sections Will be nearly closed and their momentum Willcarry them and the piston to the terminals of movement in closingdirection. The regulating valve, 5l, is adjusted so as to sufficientlycushion the exhaust from the lett hand end of the cylinder to preventIthe slamming of the door sections in closing.

The appliance is readily applicable inl connect-ion with iireboxes ofany of the ordinary constructions, and the Working parts involved arecomparatively few in number and ot ysuch character that they can be sub-.gantially made, and are protected from liability to breakage and fromdamage by the access of dirt. The operation of the door sections isquick, simple, and easy, and

the automatic closure ot the door sections effects the substantialadvantage of com-- .blown open, allowing the steam and hot Water toescape into the cab of the engine.

4lVith the mechanically operated door above described, if the doorsections should be open and the fireman be firing, the moment Aherelieves pressure from the treadle the door sections Will beautomatically closed, thereby preventing the ingress of steam and hotWater to the cab, and causing them to be blown down through the grate.

I claim as my invention and desire to secure by Letters Patent:

l. rlhe combination of a fluid pressure cylinder having a lateralopening, a differential piston Working in said cylinder and having arack on its side adjacent to said opening in position to engage a gearextending thereinto; an operating valve controlling -the supply andexhaust of fluid to and from the larger end of the piston, avalve'controlling the supply and exhaust of fluid to and trom thesmaller end ot the piston, and a triprod adjacent to the cylinder andactuated by the movement of the piston, for opening said last recitedvalve.

2 The combination ot' a uid pressure cylinder, a ditlerential pistonWorking therein, an operating valve which, when unseat ed, admits fluid,pressure lto the larger end ot vthe piston, and` when seated, exhaustsfluid pressure therefrom` and which is continuously subject to fluidsupply pressure, means i'or unseating the operating valve, and a triprod adjacent to the cylinder and actuated by the movement of the piston,for eileeting the supply and exhaust ot fluid to and 'from the smallerend thereof.

3. The combination ot a fluid pressure cylinder, a dilierential pistonWorking therein, an operating valve which, When unseated, admits fluidpressure to the larger end of the piston, and, When seated, exhaustspressure therefrom, and which is continuously subject to fluid supplypressure, means for unscating the operating valve, a valve controllingthe supply and exhaust of fluid to and from the smaller end of thepiston,

a trip rod normally adjoining the stem of said last recited valve, and atrip carried by the piston and abutting in opposite directions on thetrip rod in opposite directions ot movement of the piston.

l. The combination of' a fluid pressure cylinder, a differential pistonworking therein, headsclosing the ends of said cylinder, a valve chamberin the head adjoining the larger end of the piston, a fluid pressuresupply pipe open continuously to the valve chamberfsupply and exhaustports leading into the cylinder through the head, a valve normallyseated, undersupply pressure, in the pressure chamber, and controllingcommunication between said chamber and the adjacentend of the cylinderand between said end and the exhaust port, means for unseating saidvalve, valve chamber in the head adjoining the smaller end of thepiston, a port connecting said chamber With the supply pipe, supply andexhaust ports leading into the cylinder through said head, valvenormally seated in said pressure chamber and controlling communicationbetiveen said chamber and the adjacent end of the cylinder and betweensaid end andthe exhaust port, and a trip rod adjacent to the cylinderand actuated by the movementof the piston, for unseating said valve.

5. The combination of a fluid pressure cylinder, a differential pistonworking therein, `an automatically seating operating valve controllingthe supply and exhaust of Aluid to and from' the larger end of thepiston, means for unseating said operating valve, an automaticallyseating valve controlling the supply and exhaust of fluid to and tromlthe smaller end 'et the piston, and a trip rod adjacent to the cylinderand actuated by the movement of the piston, for unseating said lastrecited valve.

The combination ot' va fluid pressure cylinder, a diiterential pistonWorking therein, an automatically seating operating valve controllingthe supply and exhaust ot fluid to and from the larger end of the pis-.i

of the piston, for unseating said lastrecited.

valve prior to the seating of the operating cylinder, a

valve.

' 7. The combination of a Huid pressure diiferential piston Workingtherein, heads closing the ends of said cylinder, a valve chamber in thehead adjoining the larger end 'of the piston, a fluid pressure supplypipe open continuously to the valve chamber, supply and-exhaust portsAleading into the cylinder through the head, a valve normally seated,under supply pressure, in the valve chamber, and controllingcommunication between said chamber and the adjacent end of the cylinder,and between said end and the exhaust port, mechanism for unseating saidvalve, a valve chamber in the head adjoining the small-er end of thcpiston, a port connecting said chamber with the supply'pipe, supply andexhaust ports leading into the cylinder through said head, a valvenormally seated in said valve chamber and controllingcommunicationbetween said chamber and the adjacent end of the cylinderand between said end and Athe eX- haust port, a trip rod bearing on thestem of said last recited valveand lit-ted to reciprocate parallel withthe piston, two longitudinally separated shoulders formed on said triprod, and a trip fixed to the piston and adapted to abut against one orthe other of said shoulders in cach direction of its movement, to unseatand lpermit the automatic.

seating, respectively, of said last recited Copies of this patent may beob'tained for five cents each, by addressing the Commissionerof.Patents,

Washington, D.

